Isn't trying to identify the cheaters a good way to catch them?
Imagine if a math site temporarily said "2 + 2 = 5" in order to catch cheaters on a math test. You've caught some cheaters, but then some of them will continue thinking that 2 + 2 really is 5.
There must be better ways to do this.
It was more of an experiment/eye opener from the team of volunteers behind the online dictionary project.
That doesn't seem like it will provide enough evidence to actually "catch" a cheater.